"It was actually Crystal's suggestion and I thought it was a great idea," the Playboy founder tells Us Weekly. "The point of it is, we don't need gifts. A lot of people are in need and the notion of giving to charity instead of giving gifts to us just made sense."

The charities that Hefner, 85, and Harris, 24, chose include Children of the Night, an L.A.-based foundation that's dedicated to ending child prostitution; charity: water, a non-profit that aims to provide clean and safe drinking water to people in developing nations; and St. Jude Children's Research Hospital. "No child is denied treatment, and it's a wonderful organization," Hefner adds.

The bride- and groom-to-be are "expecting a full house" for their wedding, due to take place at (where else?) the Playboy mansion in L.A. on June 18. As for wedding-day jitters, Hefner jokes, "We’re waiting for responses to our invitations. If we don’t get enough responses, we won’t get married!"

But TheGirls Next Door star is "very excited" about the big day. "Crystal is wonderful and she's done a really terrific job so far with all the planning. She is the one for me!"

Trending

Ranked on a scale from 1 to 10, the trending score reflects the number of users reading a story in real time.